Suffolk University

About: Suffolk University is a education organization based out in Boston, Massachusetts, United States. It is known for research contribution in the topics: Population & Sugar beet. The organization has 6462 authors who have published 9321 publications receiving 235328 citations.

Underwriter Networks, Investor Attention, and Initial Public Offerings

Abstract: Using various “centrality” measures from Social Network Analysis (SNA), we analyze how the location of a lead IPO underwriter in its network of investment banks affects various IPO characteristics. We hypothesize that investment banking networks allow lead IPO underwriters to induce institutions to pay attention to the firms they take public and to perform two information-related roles during the IPO process: an information dissemination role, where the lead underwriter uses its investment banking network to disseminate noisy information about various aspects of the IPO firm to institutional investors; and an information extraction role, where the lead underwriter uses its investment banking network to extract information useful in pricing the IPO firm equity from institutional investors. Based on these two roles, we develop testable hypotheses relating lead IPO underwriter centrality to the IPO characteristics of firms they take public. We find that more central lead IPO underwriters are associated with larger absolute values of offer price revisions; greater IPO and after-market valuations; larger IPO initial returns; greater institutional investor equity holdings and analyst coverage immediately post-IPO; greater stock liquidity post-IPO; and better long-run stock returns. Using a hand-collected data set of pre-IPO media coverage as a proxy for investor attention, we show that an important channel through which more central lead IPO underwriters achieve favorable IPO characteristics is by attracting greater investor attention to the IPOs underwritten by them.

Topical estrogen therapy in the management of postmenopausal vaginal atrophy: an up-to-date overview

Abstract: Vaginal atrophy, a manifestation of estrogen deprivation after the menopause, could affect up to 60% of women, with a significant impact on their quality of life. It is often under-diagnosed and inadequately treated. Symptoms are more common and severe in breast cancer survivors. Systemic estrogen replacement therapy may be unacceptable for many women because of the concerns over possible risks and may not cure vaginal symptoms in up to 45% of users. Non-medicated vaginal lubricants or moisturizers have been found to be no better than placebo and less effective than estrogen. Topical vaginal estrogen preparations reverse atrophic changes and relieve associated symptoms, while avoiding systemic effects. This article provides an up-to-date overview of the role, safety and effectiveness of topical vaginal estrogen therapy.

The dentition of red deer (Cervus elaphus): a scoring scheme to assess age from wear of the permanent molariform teeth

Abstract: Skulls of red deer (Cervus elaphus of known age were examined. A scoring procedure devised for fallow deer (Dama dama) was used to relate tooth wear to a particular age (Brown & Chapman, 1990). The precise sequential nature of tooth wear as it appeared on the slopes and tips of cusps, on the marginal ridges and links between cusps was recorded. From these data a base has been provided from which estimates of age may be made of animals of unknown age. The variability for the scores are given for 95% prediction intervals from the regression of age on total molar wear score.

Detection of an outburst one year prior to the explosion of SN 2011ht

Abstract: Using imaging from the Pan-STARRS1 survey, we identify a precursor outburst at 287 and 170 days prior to the reported explosion of the purported Type IIn supernova (SN) 2011ht In the Pan-STARRS data, a source coincident with SN 2011ht is detected exclusively in the z_(P1) and y_(P1)-bands An absolute magnitude of M_z ≃ –118 suggests that this was an outburst of the progenitor star Unfiltered, archival Catalina Real Time Transient Survey images also reveal a coincident source from at least 258 to 138 days before the main event We suggest that the outburst is likely to be an intrinsically red eruption, although we cannot conclusively exclude a series of erratic outbursts which were observed only in the redder bands by chance This is only the fourth detection of an outburst prior to a claimed SN, and lends credence to the possibility that many more interacting transients have pre-explosion outbursts, which have been missed by current surveys

An empirical evaluation of camera trap study design: How many, how long and when?

Abstract: 1. Camera traps deployed in grids or stratified random designs are a well-established survey tool for wildlife but there has been little evaluation of study design parameters. 2. We used an empirical subsampling approach involving 2225 camera deployments run at 41 study areas around the world to evaluate three aspects of camera trap study design (number of sites, duration and season of sampling) and their influence on the estimation of three ecological metrics (species richness, occupancy, detection rate) for mammals. 3. We found that 25-35 camera locations were needed for precise estimates of species richness, depending on scale of the study. The precision of species-level estimates of occupancy was highly sensitive to occupancy level, with 0.75) species, but more than 150 sites likely needed for rare (<0.25) species. Species detection rates were more difficult to estimate precisely at the grid level due to spatial heterogeneity, presumably driven by unaccounted for habitat variability within the study area. Running a camera at a site for 2 weeks was most efficient for detecting new species, but 3-4 weeks were needed for precise estimates of local detection rate, with no gains in precision observed after 1 month. Metrics for all mammal communities were sensitive to seasonality, with 37-50% of the species at the sites we examined fluctuating significantly in their occupancy or detection rates over the year. This effect was more pronounced in temperate sites, where seasonally sensitive species varied in relative abundance by an average factor of 4-5, and some species were completely absent in one season due to hibernation or migration. 4. We recommend the following guidelines to efficiently obtain precise estimates of species richness, occupancy and detection rates with camera trap arrays: run each camera for 3-5 weeks across 40-60 sites per array. We recommend comparisons of detection rates be model-based and include local covariates to help account for small-scale variation. Furthermore, comparisons across study areas or times must account for seasonality, which had strong impacts on mammal communities in both tropical and temperate sites.,We used camera trap data already available through repositories or collaborators. Most data came from the eMammal or TEAM repositories. We also used one data set (China) from collaborators that was not already archived. All camera traps were set similarly, in being placed on a tree at 0.5m facing parallel to the ground, with no bait. A variety of camera models were used, but all had infrared flashes and fast (<0.5s) trigger times. Camera trap designs were either regular (grid) or stratified random.,For this paper we wanted to asess the importance of three things to camera trap study design: amount of locations surveyed (spatial), amount of time each survey ran (temporal), and rather season mattered (seasonal). We broke into three teams to analyze these data, and used three slightly different collections of data for each team. Thus, you will find three datasets labeled as to which analyses they were part of: spatial, temporal, or seasonal. All data is presented as raw detection data, giving the date, time, and species for each time photograph was recorded. These are organized as 'deployments' representing a time period a camera was placed in a given location. We are including a TXT file with the Data Dictionary from eMammal that describes all the standard fields. A few files have additional fields we added that should be self explanatory.,